Constrained by limited help and investment, consider moving toys to the top, and quilting to the bottom. If the kids are visiting, the adult that brought them can reach the toys. Move towels and such to other storage, use some of your stash to make a basket for them. If you don't already have them, buy a couple more sweater boxes for quilt stuff. And one big plastic tub (or laundry basket) to hold bulk fabric on the floor. A small investment in two over the door hooks (or a really heavy coat hanger) will let you make a full door sized organizer with pockets for all the tools and such. And don't be afraid to call a local quilting friend to stop by occasionally to help with a fetch and store. Once the tools and basics live downstairs, it is easier to send someone else on reconnaissance to get project materials.